Method and apparatus for transmitting data based on grant free in wireless communication system

ABSTRACT

A communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT) are provided. The system and method provides for receiving, from a base station, downlink control information (DCI) including information on a hybrid automatic repeat request (HARQ) process number, identifying at least one grant free resource corresponding to the information on the HARQ process number, and releasing the at least one grant free resource based on the information. The disclosure discloses a grant-free based data transmission method in a wireless communication system that may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This application is a continuation Applications of prior applicationSer. No. 16/683,618, filed on Nov. 14, 2019, which is based on andclaims priority under 35 U.S.C § 119(a) of a Korean patent applicationnumber 10-2018-0140226, filed on Nov. 14, 2018, in the KoreanIntellectual Property Office, and of a Korean patent application number10-2019-0013567, filed on Feb. 1, 2019, in the Korean IntellectualProperty Office, the disclosure of each of which is incorporated byreference herein in its entirety.

BACKGROUND 1. Field

The disclosure relates to a wireless communication system. Moreparticularly, the disclosure relates to a method and an apparatus fortransmitting and receiving data based on grant free in a wirelesscommunication system.

2. Description of Related Art

To meet the demand for wireless data traffic having increased sincedeployment of 4th generation (4G) communication systems, efforts havebeen made to develop an improved 5th generation (5G) or pre-5Gcommunication system. Therefore, the 5G or pre-5G communication systemis also called a ‘Beyond 4G Network’ or a ‘Post long term evolution(LTE) System’. The 5G communication system is considered to beimplemented in higher frequency (mmWave) bands, e.g., 60 GHz bands, soas to accomplish higher data rates. To decrease propagation loss of theradio waves and increase the transmission distance, the beamforming,massive multiple-input multiple-output (MIMO), Full Dimensional MIMO(FD-MIMO), array antenna, an analog beam forming, large scale antennatechniques are discussed in 5G communication systems. In addition, in 5Gcommunication systems, development for system network improvement isunder way based on advanced small cells, cloud Radio Access Networks(RANs), ultra-dense networks, device-to-device (D2D) communication,wireless backhaul, moving network, cooperative communication,Coordinated Multi-Points (CoMP), reception-end interference cancellationand the like. In the 5G system, Hybrid FSK and QAM Modulation (FQAM) andsliding window superposition coding (SWSC) as an advanced codingmodulation (ACM), and filter bank multi carrier (FBMC), non-orthogonalmultiple access (NOMA), and sparse code multiple access (SCMA) as anadvanced access technology have been developed.

The Internet, which is a human centered connectivity network wherehumans generate and consume information, is now evolving to the Internetof Things (IoT) where distributed entities, such as things, exchange andprocess information without human intervention. The Internet ofEverything (IoE), which is a combination of the IoT technology and theBig Data processing technology through connection with a cloud server,has emerged. As technology elements, such as “sensing technology”,“wired/wireless communication and network infrastructure”, “serviceinterface technology”, and “Security technology” have been demanded forIoT implementation, a sensor network, a Machine-to-Machine (M2M)communication, Machine Type Communication (MTC), and so forth have beenrecently researched. Such an IoT environment may provide intelligentInternet technology services that create a new value to human life bycollecting and analyzing data generated among connected things. IoT maybe applied to a variety of fields including smart home, smart building,smart city, smart car or connected cars, smart grid, health care, smartappliances and advanced medical services through convergence andcombination between existing Information Technology (IT) and variousindustrial applications.

In line with this, various attempts have been made to apply 5Gcommunication systems to IoT networks. For example, technologies such asa sensor network, Machine Type Communication (MTC), andMachine-to-Machine (M2M) communication may be implemented bybeamforming, MIMO, and array antennas. Application of a cloud RadioAccess Network (RAN) as the above-described Big Data processingtechnology may also be considered to be as an example of convergencebetween the 5G technology and the IoT technology.

As described above, with the development of a wireless communicationsystem, various services can be provided, and thus schemes foreffectively providing such services have been demanded.

The above information is presented as background information only, andto assist with an understanding of the disclosure. No determination hasbeen made, and no assertion is made, as to whether any of the abovemight be applicable as prior art with regard to the disclosure.

SUMMARY

Aspects of the disclosure are to address at least the above-mentionedproblems and/or disadvantages and to provide at least the advantagesdescribed below. Accordingly, an aspect of the disclosure is to providea method and an apparatus for efficiently activating or releasing aplurality of grant-free resources (downlink semi persistent scheduling(DL SPS) or uplink (UL) grant type 2) in a state where a terminal isconfigured with the respective grant-free resources for each cell andbandwidth part (BWP).

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments.

In accordance with an aspect of the disclosure, a method performed by aterminal is provided. The method includes receiving, from a basestation, downlink control information (DCI) including information on ahybrid automatic repeat request (HARQ) process number, identifying atleast one grant free resource corresponding to the information on theHARQ process number, and releasing the at least one grant free resourcebased on the information.

In accordance with another aspect of the disclosure, a method performedby a base station is provided. The method includes identifying at leastone grant free resource to be released, the at least one grant freeresource being configured for a terminal, generating information on ahybrid automatic repeat request (HARQ) process number corresponding tothe at least one grant free resource, and transmitting, to a terminal,downlink control information (DCI) including the information, whereinthe at least one grant free resource is released based on theinformation.

In accordance with another aspect of the disclosure, a terminal isprovided. The terminal includes a transceiver configured to transmit andreceive a signal, and at least one processor configured to receive, froma base station, downlink control information (DCI) including informationon a hybrid automatic repeat request (HARQ) process number, identify atleast one grant free resource corresponding to the information on theHARQ process number, and release the at least one grant free resourcebased on the information.

In accordance with another aspect of the disclosure, a base station isprovided. The base station includes a transceiver configured to transmitand receive a signal, and at least one processor configured to identifyat least one grant free resource to be released, the at least one grantfree resource being configured for a terminal, generate information on ahybrid automatic repeat request (HARQ) process number corresponding tothe at least one grant free resource, and transmit, to a terminal,downlink control information (DCI) including the information, whereinthe at least one grant free resource is released based on theinformation.

According to the embodiments of the disclosure, various services can beeffectively provided by efficiently supporting activation and release ofa plurality of grant-free resources configured in a wirelesscommunication system.

Other aspects, advantages, and salient features of the disclosure willbecome apparent to those skilled in the art from the following detaileddescription, which, taken in conjunction with the annexed drawings,discloses various embodiments of the disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription, taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a diagram illustrating the structure of a time-frequencydomain that is a radio resource region of a 5th generation (5G) or newradio (NR) system according to an embodiment of the disclosure;

FIG. 2 is a diagram explaining a method for allocating data of variousservices in a time-frequency resource region in a 5G or NR systemaccording to an embodiment of the disclosure;

FIG. 3 is a diagram explaining a grant-free transmission and receptionoperation according to an embodiment of the disclosure;

FIG. 4 is a diagram illustrating a method for activating and releasinggrant-free resources through downlink control information (DCI) in astate where a plurality of grant-free resources (downlink semipersistent scheduling (DL SPS) or UL grant type 2) are configuredaccording to an embodiment of the disclosure;

FIG. 5 is a diagram illustrating a method for activating and releasinggrant-free resources through DCI in a state where a plurality ofgrant-free (DL SPS or UL grant type 2) resources are configuredaccording to an embodiment of the disclosure;

FIG. 6 is a flowchart illustrating an operation performed by a terminalfor transmitting uplink data based on UL grant type 2 according to anembodiment of the disclosure;

FIG. 7 is a flowchart illustrating an operation procedure performed by aterminal according to an embodiment of the disclosure;

FIG. 8 is a flowchart illustrating a method for releasing grant-freeresources in a state where a plurality of grant-free (DL SPS or UL granttype 2) resources are configured according to an embodiment of thedisclosure;

FIG. 9 is a block diagram illustrating the structure of a terminalaccording to an embodiment of the disclosure; and

FIG. 10 is a diagram illustrating the structure of a base stationaccording to an embodiment of the disclosure.

Throughout the drawings, it should be noted that like reference numbersare used to depict the same or similar elements, features, andstructures.

DETAILED DESCRIPTION

The following description with reference to the accompanying drawings isprovided to assist in a comprehensive understanding of variousembodiments of the disclosure as defined by the claims and theirequivalents. It includes various specific details to assist in thatunderstanding but these are to be regarded as merely exemplary.Accordingly, those of ordinary skill in the art will recognize thatvarious changes and modifications of the various embodiments describedherein can be made without departing from the scope and spirit of thedisclosure. In addition, descriptions of well-known functions andconstructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are notlimited to the bibliographical meanings, but, are merely used by theinventor to enable a clear and consistent understanding of thedisclosure. Accordingly, it should be apparent to those skilled in theart that the following description of various embodiments of thedisclosure is provided for illustration purpose only and not for thepurpose of limiting the disclosure as defined by the appended claims andtheir equivalents.

It is to be understood that the singular forms “a,” “an,” and “the”include plural referents unless the context clearly dictates otherwise.Thus, for example, reference to “a component surface” includes referenceto one or more of such surfaces.

For the same reason, in the accompanying drawings, sizes and relativesizes of some constituent elements may be exaggerated, omitted, orbriefly illustrated. Further, sizes of the respective constituentelements do not completely reflect the actual sizes thereof. In thedrawings, the same drawing reference numerals are used for the same orcorresponding elements across various figures.

The aspects and features of the disclosure and methods for achieving theaspects and features will be apparent by referring to the embodiments tobe described in detail with reference to the accompanying drawings.However, the disclosure is not limited to the embodiments disclosedhereinafter, and it can be implemented in diverse forms. The mattersdefined in the description, such as the detailed construction andelements, are only specific details provided to assist those of ordinaryskill in the art in a comprehensive understanding of the disclosure, andthe disclosure is only defined within the scope of the appended claims.In the entire description of the disclosure, the same drawing referencenumerals are used for the same elements across various figures.

In this case, it will be understood that each block of the flowchartillustrations, and combinations of blocks in the flowchartillustrations, can be implemented by computer program instructions.These computer program instructions can be provided to a processor of ageneral purpose computer, special purpose computer, or otherprogrammable data processing apparatus to produce a machine, such thatthe instructions, which execute via the processor of the computer orother programmable data processing apparatus, create means forimplementing the functions specified in the flowchart block or blocks.

These computer program instructions may also be stored in a computerusable or computer-readable memory that can direct a computer or otherprogrammable data processing apparatus to function in a particularmanner, such that the instructions stored in the computer usable orcomputer-readable memory produce an article of manufacture includinginstruction means that implement the function specified in the flowchartblock or blocks.

The computer program instructions may also be loaded onto a computer orother programmable data processing apparatus to cause a series ofoperations to be performed on the computer or other programmableapparatus to produce a computer implemented process such that theinstructions that execute on the computer or other programmableapparatus provide operations for implementing the functions specified inthe flowchart block or blocks.

Also, each block of the flowchart illustrations may represent a module,segment, or portion of code, which includes one or more executableinstructions for implementing the specified logical function(s). Itshould also be noted that in some alternative implementations, thefunctions noted in the blocks may occur out of the order. For example,two blocks shown in succession may in fact be executed substantiallyconcurrently or the blocks may sometimes be executed in the reverseorder, depending upon the functionality involved.

In this case, the term “˜unit”, as used in an embodiment, means, but isnot limited to, a software or hardware component, such as fieldprogrammable gate array (FPGA) or application specific integratedcircuit (ASIC), which performs certain tasks. However, “˜unit” is notmeant to be limited to software or hardware. The term “˜unit” mayadvantageously be configured to reside on the addressable storage mediumand configured to execute on one or more processors. Thus, “˜unit” mayinclude, by way of example, components, such as software components,object-oriented software components, class components and taskcomponents, processes, functions, attributes, procedures, subroutines,segments of program code, drivers, firmware, microcode, circuitry, data,databases, data structures, tables, arrays, and variables.

The functionality provided for in the components and “˜units” may becombined into fewer components and “˜units” or further separated intoadditional components and “˜units”. Further, the components and “˜units”may be implemented to operate one or more central processing unit (CPU)sin a device or a security multimedia card. Further, in an embodiment,“˜unit” may include one or more processors.

A wireless communication system was initially developed for the purposeof providing a voice-oriented service, but it has been expanded to, forexample, a broadband wireless communication system that provides ahigh-speed and high-quality packet data service together with thecommunication standards, such as 3GPP high speed packet access (HSPA),long term evolution (LTE) or evolved universal terrestrial radio access(E-UTRA), LTE-Advanced (LTE-A), 3GPP2 high rate packet data (HRPD),ultra-mobile broadband (UMB), and institute of electrical andelectronics engineers (IEEE) 802.16e. Also, for the 5th generationwireless communication system, 5th generation (5G) or new radio (NR)communication standards have been developed.

In the 5G or NR system that is a representative example of broadbandwireless communication systems, the downlink (DL) and uplink (UL) adoptorthogonal frequency division multiplexing (OFDM) schemes. Morespecifically, the downlink adopts a cyclic-prefix OFDM (CP-OFDM) scheme,and the uplink (UL) adopts a discrete Fourier transform spreading OFDM(DFT-S-OFDM) scheme in addition to the CP-OFDM.

The uplink means a radio link in which a terminal (or user equipment(UE) or mobile station (MS)) transmits data or a control signal to abase station (or gNodeB, eNode B, or base station (BS)), and thedownlink means a radio link in which the base station transmits data ora control signal to the terminal. Such a multi-access scheme maydiscriminate data or control information of respective users from eachother by allocating and operating time-frequency resources on which thedata or control information of the respective users is to be carried sothat the time-frequency resources do not overlap each other, that is, soas to establish orthogonality.

The 5G or NR system adopts a hybrid automatic repeat request (HARQ)scheme in which a physical layer retransmits the corresponding data ifdecoding failure occurs during an initial transmission. According to theHARQ scheme, a receiver may transmit information (negativeacknowledgement (NACK)) for notifying a transmitter of the decodingfailure if the receiver has not accurately decoded the data, and thetransmitter may make a physical layer retransmit the corresponding data.The receiver may combine the data that is retransmitted by thetransmitter with the previous data of which the decoding has failed toheighten the data reception performance. Further, if the receiver hasaccurately decoded the data, the HARQ scheme may transmit information(acknowledgement (ACK)) for notifying of a decoding success to thetransmitter, so that the transmitter can transmit new data.

Meanwhile, the NR system that is the new 5G communication has beendesigned so that various services can be freely multiplexed on time andfrequency resources, and thus waveform/numerology and reference signalsare dynamically or freely allocated as needed for correspondingservices. In order to provide optimum services to the terminal inwireless communications, it is important to optimize the datatransmission through measurement of the channel quality and theinterference amount, and thus it is essential to measure an accuratechannel state. However, in the case of the 5G or NR channels, incontrast with the 4th generation (4G) communication in which the channeland interference characteristics are not greatly changed in accordancewith the frequency resources, the channel and interferencecharacteristics are greatly changed in accordance with the services, andthus it is necessary to support a subset of a frequency resource group(FRG) level that makes it possible to dividedly measure the channelstate.

In the 5G or NR system, supported services may be divided intocategories of an enhanced mobile broadband (eMBB), massive machine typecommunications (mMTC), and ultra-reliable and low-latency communications(URLLC). The eMBB is a service aimed at high-speed transmission ofhigh-capacity data, the mMTC is a service aimed at minimization of aterminal power and accesses of a plurality of terminals, and the URLLCis a service aimed at high reliability and low latency. Differentrequirements may be applied in accordance with the kind of servicesapplied to the terminal.

Among the above-described services, the URLLC service is aimed at highreliability and low latency, and thus it may be necessary to transmitcontrol information and data information, which may be transmitted on aphysical channel, at a low coding rate. In the case of the controlinformation, iterative transmission of the control information has beenintroduced in the LTE MTC or narrow band Internet-of-things (NB-IoT)services. The purpose of such introduction is to provide a high coveragefor terminals having low bandwidths, and thus latency has not been fullyconsidered. Further, the minimum unit of the iterative transmission ofthe control information is fixed to the unit of a subframe based on theLTE. Accordingly, in order to support the URLLC service in the NR or 5Gsystem, it is necessary to introduce an iterative transmission mode ofcontrol information, which can improve reliability while requiring lowlatency.

Accordingly, in the disclosure, a situation in which control informationis iteratively transmitted within a slot is basically considered. Inaddition, a situation in which control information that may betransmitted over the slot boundary is iteratively transmitted is alsounder consideration. Through operations provided in the disclosure, itis possible for a terminal to detect control information that istransmitted from a base station at an earlier time with highreliability.

All terms used in the description have been defined in consideration oftheir respective functions, but they may differ depending on intentionsof a user or operator, or customs. Accordingly, they should be definedon the basis of the contents of the whole description of the disclosure.Hereinafter, a base station is the subject that performs resourceallocation to a terminal, and it may be at least one of gNode B (gNB),eNode B (eNB), Node B, base station (BS), radio access unit, basestation controller or at least one processor, or node on a network. Aterminal may include user equipment (UE), mobile station (MS), cellularphone, smart phone, computer, or multimedia system that can perform acommunication function. In the disclosure, a downlink (DL) is a radiotransmission path of a signal that is transmitted from the base stationto the terminal, and an uplink (UL) means a radio transmission path of asignal that is transmitted from the terminal to the base station.Hereinafter, although the NR system is exemplified in the disclosure,the disclosure is not limited thereto, but embodiments of the disclosurecan be applied to even various communication systems having similartechnical backgrounds or channel types. Further, the embodiments of thedisclosure may also be applied to other communication systems throughpartial modifications thereof in a range that does not greatly deviatefrom the scope of the disclosure through the judgment of those skilledin the art.

In the disclosure, terms in the related art “physical channel” and“signal” may be interchangeably used with “data” or “control signal”.For example, a physical downlink shared channel (PDSCH) is a physicalchannel on which data is transmitted, but in the disclosure, PDSCH maybe referred to as data (or downlink data).

In the disclosure, higher signaling is a method for transferring asignal from the base station to the terminal using a downlink datachannel of the physical layer, or transferring a signal from theterminal to the base station using an uplink data channel of thephysical layer, and it may be mentioned as radio resource control (RRC)signaling or a medium access control (MAC) control element (CE).

Recently, as researches for the next generation communication system arein progress, various schemes for scheduling communication with aterminal have been discussed. Accordingly, efficient scheduling and datatransmission/reception schemes in consideration of the characteristicsof the next generation communication system have been demanded.Accordingly, in order to provide a plurality of services to a user inthe communication system, a method capable of providing respectiveservices to suit the features of the corresponding services at the sametime interval and an apparatus using the method have been demanded.

In order to transmit or receive data to or from the base station, theterminal should receive separate control information from the basestation. However, in the case of a service type that requiresperiodically occurring traffics or low-latency/high-reliability, it maybe possible to transmit or receive the data without the separate controlinformation. In the disclosure, such a transmission scheme is called aconfigured grant or grant-free based data transmission method.

It may be considered that a method by a terminal for receiving ortransmitting data after configuration of a data transmission resourceconfigured through control information and reception of relatedinformation is of a first signal transmission/reception type, and amethod by a terminal for transmitting or receiving data based onpreconfigured information without control information is of a secondsignal transmission/reception type. According to the second signaltransmission/reception type, preconfigured resource regions existperiodically, and in the regions, UL type 1 grant that is a methodconfigured only by a higher signal and UL type 2 grant (or SPS) that isa method configured by a combination of the higher signal and L1 signal.In the case of the UL type 2 grant (or SPS), partial informationrequired by the terminal is determined by the higher signal, and whetherto transmit other actual data is determined by the L1 signal. Here, theL1 signal is briefly divided into a signal indicating activation of aresource configured by the higher signal and a signal indicating releaseof the activated resource. In the disclosure, a method for activating orreleasing the resource through the L1 signal if one or more resourcesconfigured by the higher signal exist.

FIG. 1 is a diagram illustrating the structure of a time-frequencydomain that is a radio resource region of a 5G or NR system according toan embodiment of the disclosure.

Referring to FIG. 1 , in a radio resource region, a horizontal axisrepresents a time domain, and a vertical axis represents a frequencydomain. In the time domain, the minimum transmission unit is an OFDMsymbol, and N_(symb) OFDM symbols 102 constitute one slot 106. Thelength of the subframe may be defined as 1.0 ms, and a radio frame 114may be defined as 10 ms. In the frequency domain, the minimumtransmission unit is a subcarrier, and the transmission bandwidth of thewhole system may be composed of N_(BW) subcarriers 104 in total.However, such numerical values may be variably applied in accordancewith the system.

The basic unit of the time-frequency resource region is a resourceelement (hereinafter, RE) 112 that may be expressed by an OFDM symbolindex and a subcarrier index. A resource block (hereinafter, RB) 108 ora physical resource block (hereinafter, PRB) may be defined by N_(symb)successive OFDM symbols 102 in the time domain and N_(RB) successivesubcarriers 110 in the frequency domain. Accordingly, one RB 108 may becomposed of N_(symb)×N_(RB) REs 112.

In general, the minimum transmission unit of data is RB. In the 5G or NRsystem, it is general that N_(symb)=14 and N_(RB)=12, and N_(BW) andN_(RB) may be in proportion to the bandwidth of the system transmissionband. The data rate is increased in proportion to the number of RBs thatare scheduled to the terminal. In the case of a frequency divisionduplex (FDD) system that operates to discriminate a downlink and anuplink by means of frequency in the 5G or NR system, the downlinktransmission bandwidth and the uplink transmission bandwidth may differfrom each other. A channel bandwidth presents a RF bandwidth thatcorresponds to the system transmission bandwidth. Table 1 below presentsthe corresponding relationship between the system transmission bandwidththat is defined by an LTE system that is the 4th wireless communicationsystem before the 5G or NR system. For example, the LTE system having 10MHz channel bandwidth may have the transmission bandwidth that iscomposed of 50 RBs.

TABLE 1 Channel bandwidth BW_(Channel) [MHz] 1.4 3 5 10 15 20Transmission bandwidth 6 15 25 50 75 100 configuration NRB

The 5G or NR system may operate in a channel bandwidth that is widerthan the channel bandwidth of the LTE as presented in Table 1. Table 2presents the corresponding relationship among a system transmissionbandwidth, channel bandwidth, and subcarrier spacing (SCS) in the 5G orNR system.

TABLE 2 SCS Channel bandwidth BW_(Channel) [MHz] [kHz] 5 10 15 20 25 4050 60 80 100 Maximum 15 25 52 79 106 133 216 270 N.A. N.A. N.A.Transmission 30 11 24 38 51 65 106 133 162 217 273 bandwidth 60 N.A. 1118 24 31 51 65  79 107 135 N_(RB)

In the 5G or NR system, scheduling information on downlink data oruplink data is transferred from the base station to the terminal throughdownlink control Information (DCI). The DCI may be defined in accordancewith various formats, and it may indicate whether the DCI is schedulinginformation on uplink data (UL grant) or scheduling information ondownlink data (DL grant) according to each format, whether the DCI iscompact DCI having a small size of control information, whether spatialmultiplexing using multiple antennas is applied, and whether the DCI isa DCI for power control. For example, DCI format 1-1 that is thescheduling control information on the downlink data (DL grant) mayinclude at least one piece of the following control information.

-   -   Carrier indicator: This indicates on what frequency carrier the        corresponding DCI is transmitted.    -   DCI format indicator: This is an indicator discriminating        whether the corresponding DCI is for a downlink or an uplink.    -   Bandwidth part (hereinafter, BWP) indicator: This indicates from        what BWP the corresponding DCI is transmitted.    -   Frequency domain resource assignment: This indicates the RB of        the frequency domain allocated to the data transmission. An        expressed resource is determined in accordance with the system        bandwidth and resource allocation scheme.    -   Time domain resource assignment: This indicates from what OFDM        symbol of what slot a data related channel is transmitted.    -   VRB-to-PRB mapping: This indicates in what scheme a virtual RB        (hereinafter, VRB) index and a physical RB (hereinafter, PRB)        index are mapped on each other.    -   Modulation and coding scheme (hereinafter, MCS): This indicates        a modulation scheme and a coding rate used for data        transmission. That is, this may indicate information on whether        the modulation is quadrature phase shift keying (QSK), 16        quadrature amplitude modulation (QAM), 64 QAM, or 256 QAM and a        coding rate value capable of notifying of a transport block size        (TBS) and channel coding information.    -   Codeblock group (CBG) transmission information: This indicates        information on what CBG is to be transmitted if retransmission        is configured.    -   HARQ process number: This indicates a process number of HARQ.    -   New data indicator: This indicates whether HARQ is initially        transmitted or retransmitted.    -   Redundancy version: This indicates a redundancy version of HARQ.    -   Transmit power control (TCP) command for a physical uplink        control channel (PUCCH): This indicates a transmission power        control command for PUCCH that is an uplink control channel.

In the case of the physical uplink channel (PUSCH) transmission asdescribed above, the time domain resource assignment may be transferredby information on a slot in which the PUSCH is transmitted, start OFDMsymbol location S in the corresponding slot, and the number L of OFDMsymbols on which the PUSCH is mapped. The above-described S may be arelative location from the start of the slot, L may be the number ofsuccessive OFDM symbols, and S and L may be determined by a start andlength indicator value (SLIV) defined as in Equation (1) below.If (L−1)≤7 thenSLIV=14*(L−1)+S

-   -   else        SLIV=14*(14−L+1)+(14−1−S)        where 0<L≤14−S  Equation (1)

Generally, in the 5G or NR system, it is possible to be configured witha table in which information on the SLIV value, the PUSCH mapping type,and the PUSCH transmission slot is included in one row through RRCconfiguration. Thereafter, in the time domain resource assignment of theDCI, the base station can transfer the information on the SLIV value,the PUSCH mapping type, and the PUSCH transmission slot to the terminalby indicating index values in the configured table.

In the 5G or NR system, as the PUSCH mapping type, type A and type B aredefined. According to the PUSCH mapping type A, the first OFDM symbol ofdemodulation reference signal (DMRS) OFDM symbols is located in thesecond or third OFDM symbol in the slot. According to the PUSCH mappingtype B, the first OFDM symbol of the DMRS OFDM symbols is located in thefirst OFDM symbol on the time domain resource allocated through PUSCHtransmission. The PUSCH time domain resource allocation method asdescribed above may be equally applied to the PDSCH time domain resourceallocation.

The DCI may pass through a channel coding and modulation process, and itmay be transmitted on a physical downlink control channel (PUCCH) thatis a downlink physical control channel (or control information,hereinafter, interchangeably used with each other).

In general, the DCI is scrambled with a specific radio network temporaryidentifier (RNTI) (or terminal identifier) independently of respectiveterminals to be added with a cyclic redundancy check (CRC), ischannel-coded, and then is configured as independent PDCCHs to betransmitted. The PDCCH is mapped onto a control resource set (CORESET)configured to the terminal to be transmitted.

The downlink data may be transmitted on a physical downlink sharedchannel (PDSCH) that is a physical channel for downlink datatransmission. The PDSCH may be transmitted after a control channeltransmission interval, and scheduling information, such as detailedmapping location and modulation scheme, is determined based on the DCIbeing transmitted through the PDCCH.

Through the MCS of the control information constituting the DCI, thebase station notifies the terminal of a modulation scheme applied to thePDSCH intended to be transmitted to the terminal and the size of data(TBS) intended to be transmitted. In one embodiment, the MCS may becomposed of 5 bits or more or less. The TBS corresponds to the size ofthe data (transport block (hereinafter, TB)) that the base stationintends to transmit before the channel coding for error correction isapplied thereto.

In the disclosure, the transport block (hereinafter, TB) may include aMAC header, a MAC control element (CE), one or more MAC service dataunits (SDUs), and padding bits. Further, the TB may indicate a data unitthat gets down from the MAC layer to the physical layer or a protocoldata unit (PDU).

The modulation scheme that is supported in the 5G or NR system may bequadrature phase shift keying (QPSK), 16 quadrature amplitude modulation(16 QAM), 64QAM, and 256 QAM, and respective modulation orders Qmcorrespond to 2, 4, 6, and 8. That is, in the case of QPSK modulation, 2bits per symbol may be transmitted, and in the case of 16 QAM, 4 bitsper OFDM symbol may be transmitted. Further, in the case of 64 QAM, 6bits per symbol may be transmitted, and in the case of 256 QAM, 8 bitsper symbol may be transmitted.

In the 5G or NR system, in the case of indicating a time resourceallocation field index m included in the DCI when the terminal isscheduled with the PDSCH or PUSCH by the DCI, this indicates acombination of DRMS type A position information corresponding to m+1,PDSCH mapping type information, slot index K0, data resource startsymbol S, and data resource allocation length L in the table indicatingtime domain resource allocation information. As an example, Table 3 is atable including time domain resource allocation information.

TABLE 3 PDSCH time domain resource allocation based on normal cyclicprefix dmrs-TypeA- PDSCH Row index Position mapping type K₀ S L 1 2 TypeA 0 2 12 3 Type A 0 3 11 2 2 Type A 0 2 10 3 Type A 0 3 9 3 2 Type A 0 29 3 Type A 0 3 8 4 2 Type A 0 2 7 3 Type A 0 3 6 5 2 Type A 0 2 5 3 TypeA 0 3 4 6 2 Type B 0 9 4 3 Type B 0 10 4 7 2 Type B 0 4 4 3 Type B 0 6 48 2, 3 Type B 0 5 7 9 2, 3 Type B 0 5 2 10 2, 3 Type B 0 9 2 11 2, 3Type B 0 12 2 12 2, 3 Type A 0 1 13 13 2, 3 Type A 0 1 6 14 2, 3 Type A0 2 4 15 2, 3 Type B 0 4 7 16 2, 3 Type B 0 8 4

In Table 3, dmrs-typeA-Position denotes a field notifying of a symbollocation in which DMRS is transmitted in one slot indicated by a systeminformation block (SIB) that is one piece of terminal common controlinformation. A possible value of the corresponding field is 2 or 3. Ifit is assumed that the number of symbols that constitute one slot is 14in total, and the first symbol index is “0”, “2” means the third symbol,and “3” means the fourth symbol.

In Table 3, PDSCH mapping type denotes information notifying of the DMRSlocation in a scheduled data resource region. If the PDSCH mapping typeis “A”, the DMRS is always transmitted or received in the symbollocation determined by dmrs-typeA-Position regardless of the allocateddata time domain resources. If the PDSCH mapping type is “B”, the DMRSis always transmitted or received in the first symbol of the allocateddata time domain resources that is the DMRS location. In other words,the PDSCH mapping type B does not use dmrs-typeA-Position information.In Table 3, K₀ means an offset between a slot index to which the PDCCHon which the DCI is transmitted belongs and a slot index to whichscheduled PDSCH or PUSCH belongs in the corresponding DCI. As anexample, if the slot index of the PDCCH is “n”, the slot index of thePDSCH or PUSCH scheduled by the DCI of the PDCCH is n+K₀. In Table 3, Smeans a start symbol index of the data time domain resources in oneslot. The possible S value is in the range of 0 to 10 based on thenormal cyclic prefix.

In Table 3, L means the length of the data time domain resource intervalin one slot. The possible L value is in the range of 1 to 14. However,the possible S and L values are determined by the following mathematicalexpression 1, Table 4, and Table 5. Table 3 may present default valuesused by the terminal before the terminal receives the time resourceallocation information through terminal-specific or terminal-commonhigher signaling. As an example, the DCI format 0_0 or 1_0 may alwaysuse Table 3 as default time resource region values.

Table 3 presents PDSCH time domain resource allocation values, and inorder to allocate the PUSCH time domain resource, the value K1 is usedin replacement of K2. Table 3-1 below is an example of a PUSCH timedomain resource allocation table.

TABLE 3-1 Normal cyclic prefix based PDSCH time domain resourceallocation PUSCH Row index mapping type K₂ S L 1 Type A j 0 14 2 Type Aj 0 12 3 Type A j 0 10 4 Type B j 2 10 5 Type B j 4 10 6 Type B j 4 8 7Type B j 4 6 8 Type A j + 1 0 14 9 Type A j + 1 0 12 10 Type A j + 1 010 11 Type A j + 2 0 14 12 Type A j + 2 0 12 13 Type A j + 2 0 10 14Type B j 8 6 15 Type A j + 3 0 14 16 Type A j + 3 0 10

Table 4 below is a table presenting combinations of possible S and Ldepending on whether the cyclic prefix is normal or extended and whetherthe PDSCH mapping type is type A or type B.

TABLE 4 Combination of S and L to which PDSCH time domain resource canbe allocated PDSCH Normal cyclic prefix Extended cyclic prefix mappingtype S L S + L S L S + L Type A {0, 1, 2, 3} {3, . . . , 14} {3, . . . ,14} {0, 1, 2, 3} {3, . . . , 12} {3, . . . , 12} (Note 1) (Note 1) TypeB {0, . . . , 12} {2, 4, 7} {2, . . . , 14} {0, . . . , 10} {2, 4, 6}{2, . . . , 12} Note 1: S = 3 is appficabie only if dmrs - TypeA -Position = 3

Table 5 below is a table presenting combinations of possible S and Ldepending on whether the cyclic prefix is normal or extended and whetherthe PUSCH mapping type is type A or type B.

TABLE 5 Combination of S and L to which PUSCH time domain resource canbe allocated PUSCH Normal cyclic prefix Extended cyclic prefix mappingtype S L S + L S L S + L Type A 0 {4, . . . , 14} {4, . . . , 14} 0 {4,. . . , 12} {4, . . . , 12} Type B {0, . . . , 13} {1, . . . , 14} {1, .. . , 14} {0, . . . , 12} {1, . . . , 12} {1, . . . , 12}

In Table 3, it may be possible to configure respective indexes throughhigher signaling parameter PDSCH-TimeDomain ResourceAllocationList orPUSCH-TimeDomainResourceAllocationList.

PDSCH-TimeDomainResourceAllocationList is composed of one or a pluralityof higher signaling parameter PDSCH-TimeDomainResourceAllocation, and inthe PDSCH-TimeDomainResourceAllocation, k0, mappingtype, andstartSymbolAndLength exist. A possible value of k0 is in the range of 0to 32. Type A or type B may correspond to mappingtype. The possiblevalue of StartSymbolAndLength is in the range of 0 to 127. As describedabove, if mappingtype is type A, the DMRS symbol location follows thevalue indicated in dmrs-typeA-Position.

PUSCH-TimeDomainResourceAllocationList is composed of one or a pluralityof higher signaling parameter PUSCH-TimeDomainResourceAllocations, andin the PUSCH-TimeDomainResourceAllocation, k0, mapping type, andstartSymbolAndLength exist. The possible value of k0 is in the range of0 to 32. Type A or type B may correspond to mappingtype. The possiblevalue of startSymbolAndLength is in the range of 0 to 127. As describedabove, if mappingtype is type A, the DMRS symbol location follows thevalue indicated in dmrs-typeA-Position.

The above-described PDSCH-TimeDomainResourceAllocation orPUSCH-TimeDomainResource Allocation is a PDSCH or PUSCH time domainresource allocation method in one slot. The higher signalingaggregationFactorDL means the number of slots in whichPDSCH-TimeDomainResourceAllocation values applied in one slot areiteratively transmitted. The higher signaling aggregationFactorUL meansthe number of slots in which PUSCH-TimeDomainResourceAllocation valuesapplied in one slot are iteratively transmitted. The range of possiblevalues of aggregationFactorDL and aggregationFactorUL is {1, 2, 4, 8}.As an example, if aggregationFactorDL is 8, it means that one value ofpossible PDSCH-TimeDomainResourceAllocations is iteratively transmittedthrough 8 slots in total. However, in a specific slot, if at least partsof symbols applied to PDSCH-TimeDomainResourceAllocation are uplinksymbols, the PDSCH transmission/reception of the corresponding slot isomitted. In a similar manner, if at least parts of symbols applied toPUSCH-TimeDomainResourceAllocation are downlink symbols in a specificslot, the PUSCH transmission/reception of the corresponding slot isomitted.

FIG. 2 is a diagram explaining a method for allocating data of variousservices in a time-frequency resource region in a 5G or NR systemaccording to an embodiment of the disclosure.

Referring to FIG. 2 , in a whole system frequency band 200, data foreMBB, URLLC, and mMTC may be allocated. If URLLC data 203, 205, and 207are generated while eMBB 201 and mMTC 209 are allocated and transmittedin a specific frequency band, and transmission of the generated URLLCdata is necessary, it is possible to transmit the URLLC data 203, 205,and 207 without emptying a portion in which the eMBB 201 and the mMTC209 have already been allocated or without transmitting the eMBB 201 andthe mMTC 209. Because it is necessary to reduce the latency of the URLLCduring the above-described services, the URLLC data may be allocated toa portion of the resource allocated to the eMBB or mMTC to betransmitted. If the URLLC is additionally allocated to theeMBB-allocated resource to be transmitted, eMBB data may not betransmitted in the redundant time-frequency resources, and thustransmission performance of the eMBB data may be lowered. That is, aneMBB data transmission failure due to the URLLC allocation may occur.

FIG. 3 is a diagram explaining a grant-free transmission and receptionoperation according to an embodiment of the disclosure.

In a first signal transmission/reception type, a terminal receives DCIfrom a base station, and it performs downlink data reception or uplinkdata transmission in accordance with transmission configurationinformation indicated by the corresponding DCI. In a second signaltransmission/reception type, the terminal performs the downlink datareception or uplink data transmission in accordance with informationpreconfigured by a higher signal without receiving the DCI. In thedisclosure, the terminal operation method for the second signaltransmission/reception type will be mainly described. In the disclosure,an SPS that is the second signal type for receiving the downlink datameans grant-free based PDSCH transmission and reception in the downlink,and UL grant type that is the second signal type for transmitting theuplink data means grant-free based PUSCH transmission and reception inthe uplink. The UL grant type includes UL grant type 1 in which thewhole grant-free based PUSCH related configuration information isreceived only through the higher signal, and UL grant type 2 in whichthe whole grant-free based PUSCH related configuration information isreceived through the higher signal and DCI signal. Specifically, in theUL grant type 1, the terminal can perform the grant-free based PUSCHtransmission only through higher signal configuration without receivingthe DCI, whereas in the UL grant type 2, the terminal can perform thegrant-free based PUSCH transmission through the DCI reception afterreceiving the higher signal configuration. For reference, the downlinksemi persistent scheduling (DL SPS) enables the terminal to receive thegrant-free based PDSCH transmission through the higher signalconfiguration and additional configuration information indicated by theDCI in a similar manner as the UL grant type 2.

The DL SPS means downlink semi-persistent scheduling, and it correspondsto a method by the base station for periodically transmitting andreceiving downlink data information to and from the terminal based onthe information configured through the higher signaling without specificdownlink control information scheduling. The DL SPS is applicable in aVoIP or traffic situation that occurs periodically. Further, althoughthe resource configuration for the DL SPS is periodic, actuallygenerated data may be aperiodic. In this case, the terminal does notknow whether data is actually generated on the periodically configuredresource, and thus it may be possible to perform the following types ofoperations.

-   -   Method 1: With respect to the periodically configured DL SPS        resource region, the terminal transmits HARQ-ACK information to        the base station with respect to the uplink resource region        corresponding to the corresponding resource region with respect        to the result of demodulation/decoding of the received data.    -   Method 2: With respect to the periodically configured DL SPS        resource region, the terminal transmits HARQ-ACK information to        the base station with respect to the uplink resource region        corresponding to the corresponding resource region with respect        to the result of demodulation/decoding of the received data if        at least signal detection with respect to the DMRS or data has        successfully been performed.    -   Method 3: If decoding/demodulation has succeeded with respect to        the periodically configured DL SPS resource region (i.e., ACK        occurrence), the terminal transmits HARQ-ACK information to the        base station with respect to the uplink resource region        corresponding to the corresponding resource region with respect        to the result of demodulation/decoding of the received data.

In method 1, even if the base station does not actually transmit thedownlink data with respect to the DL SPS resource region, the terminalalways transmits the HARQ-ACK information to the uplink resource regioncorresponding to the corresponding DL SPS resource region. In method 2,because the terminal does not know when the base station transmits datato the DL SPS resource region, it may be possible for the terminal totransmit the HARQ-ACK information in a situation in which the terminalknows whether to transmit/receive the data, such as in a situation inwhich the terminal has succeeded in the DMRS detection or in the CRCdetection. In method 3, only in the case where the terminal hassucceeded in the data demodulation/decoding, the terminal transmits theHARQ-ACK information to the uplink resource region corresponding to thecorresponding DL SPS resource region.

Among the above-described methods, it may be possible for the terminalto support only one or two or more methods. It may be possible to selectone of the above-described methods through the standard or the highersignal. As an example, if method 1 is indicated through the highersignal, it may be possible for the terminal to perform the HARQ-ACKinformation with respect to the corresponding DL SPS based on method 1.Further, it may also be possible to select one method in accordance withthe DL SPS higher configuration information. As an example, if thetransmission period is equal to or larger than n slots in the DL SPShigher configuration information, the terminal may apply method 1, andin contrast, it may be possible for the terminal to apply method 3. Inthe disclosure, although the transmission period has been exemplified,it may be sufficiently possible to apply the method through an appliedMCS table, DMRS configuration information, or the higher signaling.

The terminal performs downlink data reception in the downlink resourceregion configured through the higher signaling. It may be possible toactivate or release, through L1 signaling, the downlink resource regionconfigured through the higher signaling.

The UL grant type 2 or UL grant type 1 is a method by the base stationfor transmitting and receiving uplink data information periodically oraperiodically to and from the terminal in the periodically configureduplink resource region based on the information configured through thehigher signaling without scheduling specific downlink controlinformation. The terminal transmits the uplink data in the uplinkresource region configured through the higher signaling. It may bepossible to activate or release, through L1 signaling, the uplinkresource region configured through the higher signaling. Thecorresponding method is called UL grant type 2. In contrast, the ULgrant type 1 is a method in which it is possible for the terminal todetermine that the uplink resource region configured through the highersignaling without separate L1 signaling has been activated.

FIG. 3 illustrates an operation for the DL SPS or UL grant type 2. Theterminal receives grant-free based UL grant type 2 configurationinformation from the base station through the following higher signals.

-   -   frequencyHopping: A field notifying whether the frequency        hopping is intra-slot hopping or inter-slot hopping. If this        field does not exist, the frequency hopping is deactivated.    -   cg-DMRS-Configuration: DMRS configuration information.    -   mcs-Table: A field notifying whether to use 256QAM MCS table or        new64QAM MCS table during PUSCH transmission without transform        precoding. If this field does not exist, the 64QAM MCS table is        used.    -   mcs-TableTransformPrecoder: A field notifying of the MCS table        used by the terminal during transform precoding based PUSCH        transmission. If this field does not exist, the 64QAM MCS table        is used.    -   uci-OnPUSCH: One of dynamic or semi-static schemes. Betta-offset        is applied thereto.    -   resourceAllocation: This is to configure whether the resource        allocation type is 1 or 2.    -   rbg-Size: This is to determine one of two configurable RBG        sizes.    -   powerControlLoopToUse: This is to determine whether to apply a        closed loop power control.    -   p0-PUSCH-Alpha: This is to apply Po, PUSCH alpha values.    -   transformPrecoder: This is to configure whether to apply        transformer precoding. If this field does not exist, msg3        configuration information follows.    -   nrofHARQ-Processes: The number of configured HARQ processes.    -   repK: The number of times of iterative transmission.    -   repK-RV: An RV pattern applied to each iterative transmission        during the iterative transmission. If the number of times of        iterative transmission is 1, this field is deactivated.    -   periodicity: A transmission period that exists from minimally        two symbols up to maximally 640 to 5120 slot units according to        the subcarrier spacing.

The terminal determines UL grant type 2 configuration information inadditional consideration of the following information of the DCI thatactivates UL grant type 2 in addition to the UL grant type 2.

-   -   timeDomainAllocation: A field notifying of a PUSCH transmission        time resource region. The value K2 indicates slot offset        information for starting the UL grant type 2 transmission based        on a slot in which the DCI is transmitted.    -   frequencyDomainAllocation: A field notifying of PUSCH        transmission frequency resource region.    -   antennaPort: Antenna port configuration information applied to        the grant-free PUSCH transmission.    -   dmrs-SeqInitialization: A field configured when the transform        precoder is deactivated.    -   precodingAndNumberOfLayers.    -   srs-Resourcelndicator: A field notifying of SRS resource        configuration information.    -   mcsAndTBS: MCS and TBS applied to PUSCH transmission.    -   frequencyHoppingOffset: A frequencyhoppingoffset value.    -   pathlossReferenceIndex.

The above-described configuration information is indicated through DCIin UL grant type 2, but in the case of UL grant type 1 supportinggrant-free PUSCH without DCI activation, the above-described informationand timeDomainOffset information are configured through a higher signal.The terminal receives grant-free based UL grant type 2 configurationinformation from the base station through the following higher signals.

The terminal configures the following DL SPS configuration informationfrom a higher signal.

-   -   Periodicity: A DL SPS transmission period.    -   nrofHARQ-Processes: The number of HARQ processes configured for        DL SPS.    -   n1PUCCH-AN: HARQ resource configuration information for DL SPS.    -   mcs-Table: MCS table configuration information applied to DL        SPS.

In the disclosure, DL SPS and UL grant type configuration informationmay be configured for each primary cell (Pcell) or secondary cell(Scell), and it may also be configured for each bandwidth part (BWP).Further, it may also be possible to configure one or more DL SPS or ULgrant types for each specific cell or BWP.

Referring to FIG. 3 , the terminal determines grant-freetransmission/reception configuration information 300 through the highersignal reception for the DL SPS or UL grant type. The UL grant type 1performs uplink data transmission or downlink data reception on thecorresponding resource without separate DCI based activation/release.The DL SPS or UL grant type 2 may be able to perform datatransmission/reception with respect to a resource region 308 configuredafter receiving the DCI 302 indicating activation, and it is unable toperform data transmission/reception with respect to a resource region306 before receiving the corresponding DCI. Further, the terminal isunable to perform data transmission/reception with respect to theresource region 310 after receiving the DCI 304 indicating release.

If the following two kinds of conditions are all satisfied for SPS or ULgrant type 2 scheduling activation or release, the terminal verifies DLSPS assignment PDCCH or configured UL grant type 2 PDCCH.

-   -   Condition 1: A case where a CRC bit of a DCI format transmitted        on the PDCCH is scrambled with CS-RNTI configured through higher        signaling.    -   Condition 2: A case where a new data indicator (NDI) field for        an activated transport block is configured to 0.

If a part of a field configuring a DCI format being transmitted on theDL SPS assignment PDCCH or configured UL grant type 2 PDCCH is equal tothat presented in Table 6 and Table 7, the terminal determines thatinformation in the DCI format is effective activation or effectiverelease of the DL SPS or UL grant type 2. As an example, if the DCIformat including the information presented in Table 6 is detected, theterminal determines that the DL SPS or UL grant type 2 has beenactivated. As another example, if the DCI format including theinformation presented in Table 7 is detected, the terminal determinesthat the DL SPS or UL grant type 2 has been released.

If the part of the field configuring the DCI format being transmitted onthe DL SPS assignment PDCCH or configured UL grant type 2 PDCCH is notequal to that presented in Table 6 and Table 7, the terminal determinesthat the DCI format is detected through unmatched CRC.

TABLE 6 Special field configuration information for activation of DL SPSand UL grant type 2 DCI format DCI format DC format 0_0/0_1 1_0 1_1 HARQprocess number set to all ‘0’s set to all ‘0’s set to all ‘0’sRedundancy version set to ‘00’ set to ‘00’ For the enabled transportblock: set to ‘00’

TABLE 7 Special field configuration information for release of DL SPSand UL grant type 2 DCI format DCI format 0_0 1_0 HARQ process numberset to all ‘0’s set to all ‘0’s Redundancy version set to ‘00’ set to‘00’ Modulation and coding set a all ‘1’s set to all ‘1’s schemeResource block assignment set to all ‘1’s set to all ‘1’s

If the PDSCH is received without PDCCH reception or the PDCCH indicatingSPS PDSCH release is received, the terminal generates a correspondingHARQ-ACK information bit. Further, the terminal does not expect totransmit HARQ-ACK information for receiving two or more SPS PDSCHs onone PUCCH resource. In other words, the terminal includes only HARQ-ACKinformation for one SPS PDSCH reception on one PUCCH resource.

The DL SPS may be configured even in PCell and SCell. Parameters thatcan be configured through DL SPS higher signaling are as follows.

-   -   Periodicity: A DL SPS transmission period.    -   nrofHARQ-processes: The number of HARQ processes that can be        configured for DL SPS.    -   n1PUCCH-AN: A HARQ resource configuration for DL SPS. The base        station configures the resource on PUCCH format 0 or 1.

The above-described Table 6 and Table 7 present a field that is possiblein a situation in which only one DL SPS or UL grant type 2 is configuredfor each cell and for each BWP. The DCI fields for activating (orreleasing) respective DL SPS resources or UL grant type 2 resources in asituation in which a plurality of DL SPS or UL grant type 2 areconfigured for each cell and for each BWP may differ. In the disclosure,a method for solving such a situation is provided.

In the disclosure, all DCI formats as described above in Table 6 andTable 7 are not used to activate or release respective DL SPS or ULgrant type 2 resources. For example, DCI format 0_0 and DCI format 0_1used for scheduling the PUSCH are used to activate the UL grant type 2resource, and DCI format 1_0 and DCI format 1_1 used for scheduling thePDSCH are used to activate the DL SPS resource. For example, the DCIformat 0_0 used for scheduling the PUSCH is used for the purpose ofreleasing the UL grant type 2 resources, and the DCI format 1_0 used forscheduling the PDSCH is used for the purpose of releasing the DL SPSresource.

FIG. 4 is a diagram illustrating a DCI activation/release method in asituation in which a plurality of grant-free resources (DL SPS or ULgrant type 2) are configured according to an embodiment of thedisclosure.

Referring to FIG. 4 , a situation is shown in which a base stationconfigures two DL SPS resources (or UL grant type 2 resources) for onecell or BWP through a higher signal. If it is assumed that a first DLSPS resource (or UL grant type 2 resource) is Resource ID #1 400, andthe second DL SPS resource (or UL grant type 2 resource) is Resource ID#2, it may be possible for a terminal and a base station use a specificDCI field in order to activate or release the respective resources. Inthis case, it may be possible for the terminal and the base station toactivate or release respective DL SPS resources (or UL grant type 2resources) using the HARQ process number. For example, Resource ID #1that is the first DL SPS resource (or UL grant type 2 resource) may beactivated or released by DCI in which the HARQ process number indicates“1”. If fields constituting a DCI format that is transmitted on a DL SPSassignment PDCCH (or configured UL grant type 2 PDCCH) with respect to aspecific DL SPS resource (or UL grant type 2 resource) ID are equal tothose presented in Table 8, the DL SPS (or UL grant type 2) resourcecorresponding to the corresponding ID is activated, and if the fieldsare equal to those presented in Table 9, the DL SPS (or UL grant type 2)resource corresponding to the corresponding ID is released.

TABLE 8 Special field configuration information for activating DL SPS ID“x” and UL grant type 2 ID “x” DCI format DCI format DCI format 0_0/0_11_0 1_1 HARQ process number Indicate “x” Indicate “x” Indicate “x”Redundancy version set to ‘00’ set to ‘00’ For the enabled transportblock: set to ‘00’

TABLE 9 Special field configuration information for releasing DL SPS ID“x” and UL grant type 2 ID “x” DCI format DCI format 0_0 1_0 HARQprocess number Indicate “x” Indicate “x” Redundancy version set to ‘00’set to ‘00’ Modulation and coding set to all ‘1’s set to all ‘1’s schemeResource block assignment set to all ‘1’s set to all ‘1’s

As an example, the DL SPS ID or UL grant type 2 ID may be configured ashigher signal configuration information. If the ID is “5”, the DL SPSresource (or UL grant type 2 resources) may be activated or releasedonly by “5” indicated by the HARQ process number. As another example, itmay be also possible that the DL SPS ID or UL grant type 2 ID aredirectly configured by the HARQ process number. For example, if the HARQprocess number “5” is included in the higher configuration informationof a specific DL SPS or UL grant type 2, the DL SPS resource (or ULgrant type 2 resource) may be activated or released by the correspondingHARQ process number 5. As another example, if the HARQ process numbers“5” and “10” are included in the higher configuration information of thespecific DL SPS or UL grant type 2, the DL SPS resource (or UL granttype 2 resources) may be activated or released by the corresponding HARQprocess numbers “5” and “10”, respectively.

As an example, FIG. 4 is a diagram illustrating an operation ofindividually activating and releasing the DL SPS resource (or UL granttype 2 resource) in accordance with the HARQ process numbers. Theterminal may have the HARQ process number of “1” with respect to the DLSPS (or UL grant type 2) resource 400 having the ID of “1” through ahigher signal, activate the corresponding resource through reception ofDCI 402 including information as in Table 8, and transmit or receivegrant-free based data with respect to resources 408 after reception ofthe DCI indicating the activation. Further, the terminal may have theHARQ process number of “1” with respect to the DL SPS (or UL grant type2) resource 400 having the ID of “1” through the higher signal, andrelease the corresponding resource through reception of DCI 404including information as in Table 9. After receiving the DCI indicatingthe release, the terminal is unable to transmit or receive thegrant-free based data with respect to resource 410.

Further, the terminal may have the HARQ process number of “2” withrespect to a DL SPS (or UL grant type 2) resource 420 having the ID of“2” through the higher signal, activate the corresponding resourcethrough reception of DCI 422 including the information as in Table 8,and transmit or receive grant-free based data with respect to resources428 after reception of the DCI indicating the activation. Further, theterminal may have the HARQ process number of “2” with respect to the DLSPS (or UL grant type 2) resource 420 having the ID of “1” through thehigher signal, and release the corresponding resource through receptionof DCI 424 including the information as in Table 9. After receiving theDCI indicating the release, the terminal is unable to transmit orreceive the grant-free based data with respect to resource 430. That is,the terminal requires individual DCI in order to activate or release theresource region for the individual grant-free based data transmissionand reception.

In the above-described example, although it has been described toactivate or release the individual DL SPS (or UL grant type 2) throughthe HARQ process number, it may also be possible to use other DCI fieldsexcluding the HARQ process number. The corresponding example may be a RVvalue, frequency allocation information, time allocation information,NDI value, or a transmission type, such as broadcast/multicast/unicast.

FIG. 5 is a diagram illustrating a method for activating and releasinggrant-free resources through DCI in a state where a plurality ofgrant-free (DL SPS or UL grant type 2) resources are configuredaccording to an embodiment of the disclosure.

In a similar manner to that of FIG. 4 , it may be possible for theterminal to be configured with and operate two or more DL SPS (or ULgrant type 2) resources for each cell and for each BWP. With referenceto FIG. 4 , it has been exemplarily described that the terminal usesrespective HARQ process numbers in a DCI field in order to activate orrelease respective DL SPS (or UL grant type 2) resources.

Referring to FIG. 5 , an embodiment in which the terminal simultaneouslyactivates or releases one or more DL SPS (or UL grant type 2) resourcesthrough one piece of DCI information. For example, if DCI 502 foractivating the DL SPS (or UL grant type 2) as in Table 6 is received ina situation in which a DL SPS (or UL grant type 2) resource 500 havingan ID of “1” and a DL SPS (or UL grant type 2) resource 520 having an IDof “2” are configured, the terminal activates all the DL SPS (or ULgrant type 2) resource configurations preconfigured through the highersignal. Further, after receiving the DCI 502 indicating the activation,the terminal may transmit and receive grant-free based data with respectto DL SPS (or UL grant type 2) resources 508 to 528. Further, afterreceiving DCI 504 indicating the release, the terminal is unable totransmit or receive the grant-free based data with respect to DL SPS (orUL grant type 2) resources 510 to 532.

In order to activate two or more DL SPS (or UL grant type 2) resourcesthrough one DCI, part of next information should be transferred througha higher signal in addition to the information pre-notified through thehigher signal. This is because if the information below is configuredthrough the DCI, two or more DL SPS (or UL grant type 2) have commontime and frequency allocation information, antenna port, and DMRSsequence information.

-   -   timeDomainAllocation: A field notifying of a PUSCH transmission        time resource region. The value K2 indicates slot offset        information for starting the UL grant type 2 transmission based        on a slot in which the DCI is transmitted.    -   frequencyDomainAllocation: A field notifying of PUSCH        transmission frequency resource region.    -   antennaPort: Antenna port configuration information applied to        the grant-free PUSCH transmission.    -   dmrs-SeqInitialization: A field configured when the transform        precoder is deactivated.    -   precodingAndNumberOfLayers.    -   srs-Resourcelndicator: A field notifying of SRS resource        configuration information.    -   mcsAndTBS: MCS and TBS applied to PUSCH transmission.    -   frequencyHoppingOffset: A frequencyhoppingoffset value.    -   pathlossReferenceIndex.    -   timedomainoffset.

If the above-described information is configured as DL SPS (or UL granttype 2) higher signals, it may be possible for the terminal tosimultaneously activate or release two or more DL SPS (or UL grant type2) resources by the DCI indicating the activation or release. Further,it may be possible that the respective DL SPS (or UL grant type 2)resources have different pieces of information by the respective highersignal configuration. In this case, timedomainoffset information is usedfor the UL grant type 1 capable of transmitting and receiving thegrant-free based data without receiving the DCI, and the correspondingvalue of timedomainoffset means the system frame number (SFN). It may bepossible that the terminal uses the corresponding information as it is,or the terminal re-interprets the corresponding information as offsetinformation of the resource capable of transmitting and receiving thegrant-free based data after the slot number having received the DCIindicating the activation other than the SFN number. Further, it may bepossible that the base station notifies of the offset information by K0or K1 existing in timedomainresourceallocation instead of thetimedomainoffset information. Here, K0 means an offset value between theslot in which the DCI including the activation information istransmitted and the slot in which the grant-free based PDSCHtransmission (DL SPS) can start. Here, K1 means an offset value betweenthe slot in which the DCI including the activation information istransmitted and the slot in which the grant-free based PUSCHtransmission (UL grant type 2) can start.

In the case of utilizing such information, after receiving an activationsignal 502 from DL SPS (or UL grant type 2) resource configurationinformation having an ID of “2”, the terminal may transmit or receivethe grant-free based data from 528 to 530 in accordance with the offsetinformation. In the disclosure, although the offset unit has beendescribed through a slot, the offset unit may be a symbol unit or asub-slot (or symbol group) unit. The corresponding unit may bepredetermined in the standards or it may be possible to configure theoffset value through a separate higher signal.

With reference to FIG. 4 , activation or release of one DL SPS (or ULgrant type 2) resource corresponding to each DCI will be mainlydescribed in a situation in which the terminal can be configured with aplurality of DL SPS (or UL grant type 2) resources for each cell andeach BWP, and with reference to FIG. 5 , activation or release of aplurality of DL SPS (or UL grant type 2) resources through one DCI willbe described. For convenience in explanation, FIG. 4 illustrates anindividual configuration method, and FIG. 5 illustrates a simultaneousconfiguration method.

It may be possible that the terminal supports all operations asdescribed above with reference to FIGS. 4 and 5 , and the followingmethods may be provided.

Method 1: Configuration Through a Higher Signal

-   -   In the case of configuring DL SPS (or UL grant type 2) resources        through a higher signal, it is also notified whether the        corresponding resource is activated (or released) in an        individual configuration method or in a simultaneous        configuration method. As another method, if specific information        is true or has a value when the higher signal for configuring        the DL SPS (or UL grant type 2) resource is received, the        terminal considers that the corresponding resource corresponds        to the simultaneous configuration method, whereas if the        corresponding information is false or does not have a value, the        terminal considers that the corresponding resource corresponds        to the individual configuration method. Here, examples of the        above-described information may be timeDomainAllocation,        FrequencyDomainAllocation, AntennaPort, dmrs-SeqInitialization,        precodingAndNumberOfLayers, srs-ResourceIndicator, mcsAndTBS,        frequencyHoppingOffset, pathlossReferenceIndex, and        timedomainoffset.

Method 2: Configuration Through an L1 Signal

-   -   A plurality of DL SPS (or UL grant type 2) resources are        configured through the higher signal, and it is notified whether        the corresponding resources are activated (or released) in the        individual configuration method or in the simultaneous        configuration method through the L1 signal. For example, it may        be possible to apply the above-described methods through HARQ        process fields as in Table 10.

TABLE 10 DCI field information for DL SPS (or UL grant type 2)activation (or release) HARQ Process Number DL SPS (UL Grant Type 2)(Bitmap) Resource Number 0 (0000) 0 1 (0001) 1 2 (0010) 2 . . . . . . 15(1111)  All

With reference to Table 10 as an example, if the terminal receives DCIformat 1_0 or DCI format 1_1 for activating the DL SPS and the HARQprocess number in the corresponding DCI indicates “0”, the terminal maydetermine that the DL SPS resource having an ID of “0” is activated.Further, if the terminal receives DCI format 0_0 or DCI format 0_1 foractivating the UL grant type 2 and the HARQ process number in thecorresponding DCI indicates “0”, the terminal may determine that the ULgrant type 2 resource having an ID of “0” is activated. If the terminalreceives DCI format 1_0 or DCI format 1_1 for releasing the DL SPS andthe HARQ process number in the corresponding DCI indicates “0”, theterminal may determine that the DL SPS resource having an ID of “0” isreleased. Further, if the terminal receives DCI format 0_0 or DCI format0_1 for releasing the UL grant type 2 and the HARQ process number in thecorresponding DCI indicates “0”, the terminal may determine that the ULgrant type 2 resource having an ID of “0” is released.

As another example, if the terminal receives DCI format 1_0 or DCIformat 1_1 for activating the DL SPS and the HARQ process number in thecorresponding DCI indicates “15”, the terminal may determine that allthe DL SPS resources having been configured through a higher signal andhaving been deactivated are activated. If the terminal receives DCIformat 0_0 or DCI format 0_1 for activating the UL grant type 2 and theHARQ process number in the corresponding DCI indicates “15”, theterminal determines that all the UL grant type 2 resources having beenconfigured through the higher signal and having been deactivated up tonow are activated. If the terminal receives DCI format 1_0 or DCI format1_1 for releasing the DL SPS and the HARQ process number in thecorresponding DCI indicates “15”, the terminal determines that all theDL SPS resources having been activated up to now are released.

If the terminal receives DCI format 0_0 or DCI format 0_1 for releasingthe UL grant type 2 and the HARQ process number in the corresponding DCIindicates “15”, the terminal determines that all the UL grant type 2resources having been activated up to now are released. Here, theremainder of DCI format 0_0 or DCI format 0_1 for activating the ULgrant type 2 excluding the HARQ process field may be equal to thatpresented in Table 6. The remainder of DCI format 1_0 or DCI format 1_1for activating the DL SPS excluding the HARQ process field may be equalto that presented in Table 6. The remainder of DCI format 0_0 forreleasing the UL grant type 2 excluding the HARQ process field may beequal to that presented in Table 7. The remainder of DCI format 1_0 forreleasing the DL SPS excluding the HARQ process field may be equal tothat presented in Table 7. As another example, it may be possible to useTable 10 only for the purpose of releasing the DL SPS (or UL grant type2) resource. In this case, it may be possible to apply Table 10 only toDCI format 1_0 (or DCI format 0_0) indicating the release of the DL SPS(or UL grant type 2) resource.

In Table 10, it is assumed that one HARQ process number is mapped ontoone DL SPS (or UL grant type 2) resource ID, but it may also be possiblethat one DL SPS (or UL grant type 2) resource is mapped onto severalHARQ process numbers. As an example, in the case of configuring the DLSPS (or UL grant type 2) resource through the higher signal, it may bepossible to configure one or two or more HARQ process number(s)associated with the corresponding resource IDs together. Accordingly, inthe case where the terminal activates the DL SPS (or UL grant type 2) bya specific HARQ process number, it may be possible that one or more DLSPS (or UL grant type 2) associated with the corresponding numbers aresimultaneously activated.

Table 11 is a table for further explanation. For example, if theterminal receives DCI format 1_0 or DCI format 1_1 for activating the DLSPS and the HARQ process number in the corresponding DCI indicates “0”,the terminal may determine that the DL SPS resources having IDs of “0”and “5” are activated. Further, if the terminal receives DCI format 0_0or DCI format 0_1 for activating the UL grant type 2 and the HARQprocess number in the corresponding DCI indicates “0”, the terminal maydetermine that the UL grant type 2 resources having IDs of “0” and “5”are activated.

If the terminal receives DCI format 1_0 or DCI format 1_1 for releasingthe DL SPS and the HARQ process number in the corresponding DCIindicates “0”, the terminal may determine that the DL SPS resourceshaving IDs of “0” and “5” are released. Further, if the terminalreceives DCI format 0_0 or DCI format 0_1 for releasing the UL granttype 2 and the HARQ process number in the corresponding DCI indicates“0”, the terminal may determine that the UL grant type 2 resourceshaving IDs of “0” and “5” are released.

TABLE 11 DCI field information for DL SPS (or UL grant type 2)activation (or release) HARQ Process Number DL SPS (UL Grant Type 2)(Bitmap) Resource Number 0 (0000) 0, 5 1 (0001) 1, 5, 10 2 (0010) 2, 5,12 . . . . . . 15 (1111)  0, 2, 3, 4, . . . , 14

Although the HARQ process number has been exemplarily described as theabove-described L1 signal based discrimination method, it may also bepossible to perform discrimination through other DCI fields (RV andMCS). The Table 11 is exemplary, and it is possible that a specific HARQprocess number index has one DL SPS resource number.

In particular, an L1 signal based discrimination method may operatethrough a newly defined field separately from the existing HARQ processnumber, and in this case, a field composed of bits that are smaller thanthe 4-bit field indicating the HARQ process number in the DCI may benewly defined. For example, for a case in which DL SPS (or UL grant type2) resources the number of which is smaller than 12 are configured andoperated, a new field composed of 1 to 3 bits is defined, and it may beindicated what DL SPS (or UL grant type 2) resource isactivated/released by a certain value (e.g., HARQ process number)indicated through the 1 to 3 bits. Further, according to such anembodiment, it is possible to newly define a DCI format. That is, a newDCI format may be defined in addition to DCI format 0_0, DCI format 0_1,DCI format 1_0, and DCI format 1_1, and the base station may include anew field according to the above-described embodiment in such a new DCIformat to be transmitted to the terminal. The terminal may identify whatDL SPS (or UL grant type 2) resource is to be activated or released fromthe new field value included in the received new DCI format, and in thiscase, the corresponding new field value may serve as an index of the DLSPS (or UL grant type 2) resource that is the target ofactivation/release. Of course, the new field value may correspond to twoor more DL SPS (or UL grant type 2) resources. An example of the newfield may correspond to the HARQ process number, the time resourceallocation field, or the frequency resource allocation field.

Further, if the grant-free based data transmission/reception resourcesfor broadcast/multicast/unicast are configured, it may be possible thatthe information associated with the HARQ process number is notdetermined as an ID of the grant-free based resource information, but isdetermined as a field indicating whether the corresponding resourceinformation is broadcast, multicast, or unicast in accordance with theDL SPS (or UL grant type 2) resource that is configured through thehigher signal. Accordingly, it may be sufficiently possible to display atransmission method as a title for broadcast, multicast, or unicastinstead of the resource number described at second column in Table 10 toTable 11.

In other words, if it is possible to configure the correspondinggrant-free resource in association with at least one of broadcast,multicast, or unicast instead of the grant-free resource ID, the HARQprocess number may indicate at least one of transmission schemes(broadcast, multicast, or unicast) other than the ID value indicatingwhether to activate or release the specific grant-free resource.Accordingly, it may be possible to activate or release the resourceassociated with the specific transmission scheme. Table 12 is a tableincluding examples thereof as described above. In Table 12, information,such as packet priority information or whether to support HARQ-ACKfeedback, may be replaced and used in addition to the transmissionschemes (broadcast, unicast, and multicast).

TABLE 12 DCI field information for DL SPS (or UL grant type 2)activation (or release) HARQ Process Number DL SPS (UL Grant Type 2)(Bitmap) Resource 0 (0000) Broadcast 1 (0001) Unicast 2 (0010)Broadcast, Unicast . . . . . . 15 (1111)  Broadcast, Unicast, Multicast

According to DL SPS (or Type 2 configured grant) of Rel-15, if HARQprocess numbers and redundancy versions (RV) in DCI format 1_0/1_1 (orDCI format 0_0/0_1) including CRC scrambled with CS-RNTI have specificvalues, the terminal determines that the corresponding DCI indicatesactivation of the DL SPS (or type configured grant).

In order to indicate multiple DL SPS (or type 2 configured grant)proposed in embodiments of the disclosure by the HARQ process numbers,the terminal determines that the DCI format received based on the fieldas in Table 13a indicates activation of the DL SPS (or type 2 configuredgrant). In Table 13a, M denotes the total number of DL SPS (or type 2configured grant) configured through the higher signal. As an example,if the value M is 3, LSB 2 bits of the 4-bit HARQ process number areused to indicate an index of the DL SPS (or type 2 configured grant)being activated, and MSB 2 bits of the HARQ process number are used as aspecial field indicating activation of the DL SPS (or type 2 configuredgrant) in DCI format 1_0/1_1 (or DCI format 0_0/0_1) including CRCscrambled with CR-RNTI.

TABLE 13a Special field configuration information for activation ofmultiple DL SPS and UL grant type 2 DCI format DCI format DCI format0_0/0_1 1_0 1_1 HARQ process number If 5 ≤ M < 9, If 5 ≤ M < 9, If 5 ≤ M< 9, Set to MSB “0” Set to MSB “0” Set to MSB “0” Else if 3 ≤ M < 5,Else if 3 ≤ M < 5, Else if 3 ≤ M < 5, Set to MSB “00” Set to MSB “00”Set to MSB “00” Else if M < 3, Else if M < 3, Else if M < 3, Set to MSB“000” Set to MSB “000” Set to MSB “000” Else if M = 1 Else if M = 1 Elseif M = 1 set to all ‘0’s set to all ‘0’s set to all ‘0’s Redundancyversion set to ‘00’ set to ‘00’ For the enabled transport block: set to‘00’

In order to indicate multiple DL SPS (or type 2 configured grant)proposed in embodiments of the disclosure by the HARQ process numbers,the terminal determines that the DCI format received based on the fieldas in Table 13b indicates release of the DL SPS (or type 2 configuredgrant). In Table 13b, M denotes the total number of combinations ofreleasable DL SPS (or type 2 configured grant) configured though thehigher signal. As an example, the size of a set of releasable states ofa single or multiple DL SPS resources as in Table 11 becomes M. As anexample, if the value M is 3, LSB 2 bits of the 4-bit HARQ processnumber are used to indicate an index of the DL SPS (or type 2 configuredgrant) being released, and MSB 2 bits of the HARQ process number areused as a special field indicating release of the DL SPS (or type 2configured grant) in DCI format 1_0/1_1 (or DCI format 0_0/0_1)including CRC scrambled with CR-RNTI.

TABLE 13b Special field configuration information for release of DL SPSand UL grant type 2 DCI format DCI format 0_0 1_0 HARQ process number If5 ≤ M < 9, If 5 ≤ M < 9, Set to MSB “0” Set to MSB “0” Else if 3 ≤ M <5, Else if 3 ≤ M < 5, Set to MSB “00” Set to MSB “00” Else if M < 3,Else if M < 3, Set to MSB “000” Set to MSB “000” Else if M = 1 Else if M= 1 set to all ‘0’s set to all ‘0’s Redundancy version set to ‘00’ setto ‘00’ Modulation and coding set to all ‘1’s set to all ‘1’s schemeFrequency domain set to all ‘1’s set to all ‘1’s resource assignment

FIG. 6 is a flowchart illustrating an operation performed by a terminalfor transmitting uplink data based on UL grant type 2 according to anembodiment of the disclosure.

Referring to FIG. 6 , the terminal receives a higher signal for UL granttype 2 based PUSCH transmission from the base station at 600. In thiscase, it may be possible for the terminal to be configured with two ormore grant-free resources for each cell and for each BWP. The terminaldetects DCI including CRC scrambled with CS-RNTI, and determines whethera specific field of the corresponding DCI field satisfies a condition ofactivation at 602 or release at 606 of UL grant type 2. Examples of sucha field may correspond to RV, MCS, and frequency resource allocationfield as presented in Table 6 and Table 7. If it is determined that theDCI field indicates a specific value and the corresponding valuesatisfies the activation or release condition of the UL grant type 2, itmay be considered that the terminal has passed verification. Further,using the verification completed DCI, the terminal may activate at 604or release at 608 a plurality of UL grant type 2 resources upwardlyconfigured through the following methods.

Method 1: Individual Activation or Individual Release

-   -   The terminal determines that only specific UL grant type 2        resource, which is indicated by 3 bits or all bits of the least        significant bits (LSB) of the HARQ process number field in the        DCI having passed UL grant type 2 activation or release        verification, is activated or released.

Method 2: Individual Activation or Group Release

-   -   The terminal determines that only specific UL grant type 2        resource, which is indicated by 3 bits or all bits of the LSB of        the HARQ process number field in the DCI having passed UL grant        type 2 activation verification, is activated. Through the DCI        having passed UL grant type 2 release verification, the terminal        determines that all UL grant type 2 resources being currently        activated are released.

Method 3: Group Activation or Individual Release

-   -   Through the DCI having passed UL grant type 2 activation        verification, the terminal determines that all UL grant type 2        resources being currently activated are activated. The terminal        determines that only specific UL grant type 2 resource, which is        indicated by 3 bits or all bits of the LSB of the HARQ process        number field in the DCI having passed UL grant type 2 release        verification, is released.

Method 4: Group Activation and Group Release

-   -   Through the DCI having passed UL grant type 2 activation        verification, the terminal determines that all UL grant type 2        resources being currently deactivated are activated. The        terminal determines that all the UL grant type 2 resources being        currently activated are released through the DCI having passed        the UL grant type 2 release verification.

Method 5: Combination of the Above-Described Methods

-   -   The terminal determines that only specific UL grant type 2        resource, which is indicated by 3 bits or all bits of the LSB of        the HARQ process number field in the DCI having passed UL grant        type 2 activation or release verification, is activated or        released. Through the DCI having passed the UL grant type 2        activation verification, the terminal may determine to activate        all the UL grant type 2 resources being currently deactivated        through a specific bit value of the HARQ process number field        (e.g., if 4-bit HARQ process number is 1111), or through the DCI        having passed the UL grant type 2 release verification, the        terminal may determine to release all the UL grant type 2        resources being currently activated.

The terminal may succeed in the detection of the DCI including CRCscrambled with CS-RNTI using one of the above-described methods, and ifthe corresponding DCI indicates activation of at least one grant-freebased resource configured through a higher signal, the terminal maytransmit the grant-free based data through the corresponding resourceregion. The terminal may succeed in the detection of the DCI includingCRC scrambled with CS-RNTI using one of the above-described methods, andif the corresponding DCI is configured through the higher signal and itindicates release of the at least one grant-free based resource regionbeing already activated, the terminal expects that the grant-free baseddata is unable to be transmitted any more through the correspondingresource region.

If the grant-free based data transmission resource activation or releasecondition is not satisfied (or verification has failed) although theterminal has received the DCI information including the CRC scrambledwith CS-RNTI, the terminal considers that the DCI format information isreceived by the non-matching CRC.

In FIG. 6 , the case of the UL grant type 2 has been described, but thesame explanation can be sufficiently applied even to the DL SPS.

FIG. 7 is a flowchart illustrating an operation procedure performed by aterminal according to an embodiment of the disclosure.

Referring to FIG. 7 , the terminal receives the DCI from the basestation, and it considers a first signal transmission/reception type forperforming downlink data reception and uplink data transmission inaccordance with the transmission configuration information indicated bythe corresponding DCI. Specifically, in FIG. 7 , a procedure, in whichthe terminal receives downlink data information from the base stationafter receiving the first DCI indicating downlink data scheduling, andthen the terminal transmits corresponding HARQ-ACK information, isconsidered. The HARQ-ACK information includes information for theterminal to notify whether demodulation/decoding of the downlink datainformation has succeeded, and as an example, if the downlink datainformation demodulation/decoding has succeeded, the terminal transmits“1” to the base station, whereas if not, the terminal maps and transmits“0” to the base station.

The base station determines whether to retransmit the correspondingdownlink data information through reception of the HARQ-ACK information,and through the HARQ-ACK procedure, the base station and the terminalcan perform more reliable wireless data communication. In the 5G or NRsystem, the HARQ-ACK information transmission resource may be canceleddue to the following causes.

1. A case where the HARQ-ACK resource is changed to the downlinkresource by second DCI that is different from the first DCI.

2. A case where transmission is dropped by other uplink controlinformation (UCI) having a higher priority than that of the HARQ-ACKresource.

3. A case where the HARQ-ACK resource at least partly overlap the uplinktransmission resource indicated by the second DCI and the time orfrequency resource, and the corresponding HARQ-ACK resource has a lowerpriority than the priority of UCI being transmitted through theoverlapping uplink transmission resource.

4. A case where the base station indicates the terminal to cancel theHARQ-ACK resource transmission through the second DCI.

5. A case where the base station schedules the downlink data resourcehaving the same HARQ process number before the HARQ-ACK resourcetransmission through the second DCI.

The above-described causes are merely exemplary, and it may be possiblethat the terminal drops the HARQ-ACK transmission resource indicatedthrough the first DCI in other various cases. Further, theabove-described examples consider a situation in which the terminalreceives the second DCI from the base station before transmitting theHARQ-ACK information on the HARQ-ACK transmission resource configuredthrough the first DCI. Further, in a normal situation, the first DCI maybe first transmitted from the base station to the terminal, andthereafter the second DCI may be transmitted. In this case, a case wherethe terminal cancels the HARQ-ACK information transmission through theDCI received after transmitting the HARQ-ACK information should notoccur. Further, because the terminal requires time for performing blinddecoding of the second DCI, the base station should transmit the secondDCI in consideration of the processing time required for the terminal todecode the second DCI before the HARQ-ACK information transmission andto determine the processing time. Otherwise, the terminal is unable toexpect that the terminal drops the transmission of the HARQ-ACKinformation scheduled through the first DCI.

FIG. 7 illustrates a corresponding terminal procedure. As an example,the terminal receives the first DCI including the HARQ process number nat 700, and it receives downlink data information in accordance with theconfiguration information of the first DCI at 702. The terminalgenerates HARQ-ACK information for the downlink datademodulation/decoding result, and it cancels or drops actual HARQ-ACKinformation transmission at 704 due to at least one of theabove-described causes before the transmission. In this situation, thebase station is unable to receive a feedback of the HARQ-ACK includingdownlink data information transmission success/failure informationrelated to the HARQ process number, and it is necessary to receive thisthrough a separate indicator. If the base station, like the existingmethod, determines the result of the corresponding HARQ-ACK reception asNACK and it schedules the retransmission, waste of the downlink dataresource may occur. In an LTE or NR system, the probability that NACKoccurs on the HARQ-ACK is less than 10%, and thus it is wasteful fromthe viewpoint of using the system radio resources to determine that theHARQ-ACK information drop situation indicated by the first DCI asdescribed above is unconditionally NACK. Accordingly at least one of thefollowing methods may be considered.

Method 1: Scheduling through DCI including the same HARQ process numbern

If third DCI information transmitted from the base station at 706includes the same HARQ process number n as that of the first DCI aftertransmission of the HARQ-ACK information scheduled through the first DCIis dropped, the terminal determines that the corresponding third DCIinformation is information for retransmitting the existing droppedHARQ-ACK information. Accordingly, the terminal determines that only theHARQ-ACK information resource constituting the third DCI information iseffective, but other fields related to other downlink or uplink datascheduling are not effective.

Method 2: Scheduling of DCI that includes the same HARQ process number nand other specific DCI field is fixed to a specific value

If the third DCI information 706 transmitted from the base stationincludes the same HARQ process number n as the first DCI after theHARQ-ACK information transmission scheduled through the first DCI isdropped, and the value of a specific DCI field indicates a specificvalue, the terminal determines that the corresponding third DCIinformation is information for retransmitting the existing droppedHARQ-ACK information. An example of the specific DCI field value maycorrespond to a case where all frequency resource allocation fieldbitmaps indicate “0” or “1”. Further, a case where other MCS informationindicates the specific value may also be another example. Accordingly,the terminal may determine that only the HARQ-ACK information resourceconstituting the third DCI information is effective and it may determinethat other fields related to other downlink or uplink data schedulingare not effective.

The terminal transmits the HARQ-ACK information for downlink datarelated to the HARQ process n dropped to the HARQ-ACK resource regionindicated by at least one of the above-described methods at 708.

FIG. 8 is a flowchart illustrating a method for releasing grant-freeresources in a state where a plurality of grant-free (DL SPS or UL granttype 2) resources are configured according to an embodiment of thedisclosure.

Referring to FIG. 8 , in the case of DL SPS, the terminal may receivedata with respect to a plurality of DL SPS and it may report theHARQ-ACK on the corresponding PUCCH or PUSCH resource in a situation inwhich one or more grant-free (DL SPS or UL grant type 2) resourceregions are activated at 800. Specifically, if DL SPS resources at leastpartly overlap each other, the terminal may report the HARQ-ACKinformation on the corresponding PUCCH or PUSCH resource only withrespect to the resource having highest DL SPS resource number or low DLSPS.

Next, in the case of UL grant type 2, the terminal may transmit datawith respect to a plurality of UL grant type 2 resources. If the ULgrant type 2 resources overlap each other at a specific time, theterminal may transmit the uplink resources with respect to the UL granttype 2 resource being optionally selected or having the highest orlowest UL grant type 2 resource number at a specific time. The abovedescribed resource number may be given as the higher signal or L1 signalduring DL SPS or UL grant type 2 configuration. The resource number maybe replaced by a priority number.

Next, a method for releasing corresponding resources in a situation inwhich a plurality of grant-free resources are configured will bedescribed. For scheduling release, the terminal checks validity at 802in order to validate whether DL SPS allocation PDCCH or configured ULgrant PDCCH satisfies the following condition (801).

Condition 1: Scrambling with CS-RNTI that the CRC of the correspondingDCI format gives to a higher signal cs-RNTI

Condition 2: A new data indicator (NDI) field for the enabled transportblock indicates “0”.

As an example, if the corresponding DCI format is as in the next table13a, the terminal may determine at 804 to indicate a valid release for aspecific resource X among pre-activated grant-free resource (DL SPS orUL grant type 2).

TABLE 13a DCI format 0_0/ DCI format 1_0 HARQ process number XRedundancy version set to ‘00’ Modulation and coding scheme set to all‘1’ Frequency domain resource set to all ‘1’s assignment

As another example, if the corresponding DCI format is as presented inTable 13b, the terminal may determine at 804 to indicate a valid releasefor a specific resource X among pre-activated grant-free resource (DLSPS or UL grant type 2).

TABLE 13b DCI format 0_0/ DCI format 1_0 HARQ process number set to all‘0’ Redundancy version set to ‘00’ Modulation and coding scheme XFrequency domain resource set to all ‘1’s assignment

As still another example, if the corresponding DCI format is aspresented in Table 13c, the terminal may determine at 806 to indicate avalid release for a specific resource X among pre-activated grant-freeresource (DL SPS or UL grant type 2).

TABLE 13c DCI format 0_0/ DCI format 1_0 HARQ process number set to all‘0’ Redundancy version set to ‘00’ Modulation and coding scheme set toall ‘1’s Frequency domain resource set to all ‘0’s assignment

As still another example, if the corresponding DCI format is aspresented in Table 13d, the terminal may determine (806) to indicate avalid release for a specific resource X among pre-activated grant-freeresource (DL SPS or UL grant type 2).

TABLE 13d DCI format 0_0/ DCI format 1_0 HARQ process number set to all‘0’ Redundancy version set to ‘00’ Modulation and coding scheme set toall ‘1’s Frequency domain resource set to all ‘1’s assignment

As still another example, if the corresponding DCI format is aspresented in Table 13e, the terminal may determine (806) to indicate avalid release for a specific resource X among pre-activated grant-freeresource (DL SPS or UL grant type 2).

TABLE 13e DCI format 0_0/ DCI format 1_0 HARQ process number set to all‘1’ Redundancy version set to ‘11’ Modulation and coding-scheme set toall ‘1’s Frequency domain resource set to all ‘1’s assignment

As still another example, if the corresponding DCI format is aspresented in Table 13f, the terminal may determine (1006) to indicate avalid release for a specific resource X among pre-activated grant-freeresource (DL SPS or UL grant type 2).

TABLE 13f DCI format 0_0/ DCI format 1_0 HARQ process number set to all‘0’ Redundancy version set to ‘11’ Modulation and coding scheme set toall ‘1’s Frequency domain resource set to all ‘1’s assignment

As still another example, it may be possible that the terminaldetermines that all the pre-activated grant-free (DL SPS or UL granttype 2) resources have been cleared in the corresponding BWP withrespect to the BWP deactivated in a specific serving cell. The terminalmay determine that all the pre-activated UL grant type 1 resources havesuspended in the corresponding BWP with respect to the deactivated BWPin a specific serving cell. With respect to the activated BWP in thespecific serving cell, the terminal determines that all the suspended ULgrant type 1 resources have been (re)initialized.

FIG. 9 is a block diagram illustrating the structure of a terminalaccording to an embodiment of the disclosure.

Referring to FIG. 9 , a terminal according to the disclosure may includea terminal receiver 900, a terminal transmitter 904, and at least oneterminal processor 902. In an embodiment, the terminal receiver 900 andthe terminal transmitter 904 may be commonly called a transceiver unit.The transceiver unit may transmit/receive a signal with a base station.The signal may include control information and data. For this, thetransceiver unit may be composed of an RF transmitter for up-convertingand amplifying the frequency of a transmitted signal, and an RF receiverfor low-noise-amplifying and down-converting the frequency of a receivedsignal. Further, the transceiver unit may receive a signal through aradio channel, and may output the received signal to the terminalprocessor 902. The transceiver unit may also transmit the signal that isoutput from the terminal processor 902 through the radio channel. Theterminal processor 902 may control a series of processes so as tooperate according to the above-described embodiments.

FIG. 10 is a diagram illustrating the structure of a base stationaccording to an embodiment of the disclosure.

Referring to FIG. 10 , a base station according to an embodiment mayinclude at least one of a base station receiver 1001, a base stationtransmitter 1005, and at least one base station processor 1003. In anembodiment of the disclosure, the base station receiver 1001 and thebase station transmitter 1005 may be commonly called a transceiver unit.The transceiver unit may transmit/receive a signal with a terminal. Thesignal may include control information and data. For this, thetransceiver unit may be composed of an RF transmitter for up-convertingand amplifying the frequency of a transmitted signal, and an RF receiverfor low-noise-amplifying and down-converting the frequency of a receivedsignal. Further, the transceiver unit may receive a signal through aradio channel, and may output the received signal to the base stationprocessor 1003. The transceiver unit may also transmit the signal thatis output from the base station processor 1003 through the radiochannel. The base station processor 1003 may control a series ofprocesses so as to operate according to the above-described embodiments.

Embodiments of the disclosure that are described in the specificationand drawings are merely for easy explanation of the technical contentsof the disclosure and proposal of specific examples to helpunderstanding of the disclosure, but are not intended to limit the scopeof the disclosure. That is, it will be apparent to those of ordinaryskill in the art to which the disclosure pertains that other modifiedexamples that are based on the technical idea of the disclosure can beembodied. Further, according to circumstances, the respectiveembodiments may be operated in combination. For example, parts of thefirst, second, and third embodiments of the disclosure may be combinedwith each other to operate the base station and the terminal. Further,although the above-described embodiments have been proposed on the basisof an NR system, other modified examples based on the technical idea ofthe above-described embodiments may be embodied in other systems, suchas FDD and time division duplex (TDD) LTE systems.

While the disclosure has been shown and described with reference tovarious embodiments thereof, it will be understood by those skilled inthe art that various changes in form and details may be made thereinwithout departing from the spirit and scope of the disclosure as definedby the appended claims and their equivalents.

What is claimed is:
 1. A method performed by a terminal in a wirelesscommunication system, the method comprising: identifying a plurality ofdownlink semi-persistent scheduling (SPS) resources; receiving one ormore SPS physical downlink shared channels (PDSCHs) based on theplurality of downlink SPS resources; and reporting hybrid automaticrepeat request-Acknowledgement (HARQ-ACK) information corresponding to afirst SPS PDSCH associated with a downlink SPS resource with a lowestnumber configured by a higher layer signaling, in case that the firstSPS PDSCH associated with the downlink SPS resource with the lowestnumber at least partially overlaps with any other SPS PDSCH.
 2. Themethod of claim 1, wherein the HARQ-ACK information is transmitted on aphysical uplink control channel (PUCCH).
 3. The method of claim 1,further comprising: receiving, from a base station, configurations forthe plurality of downlink SPS resources; receiving, from the basestation, first downlink control information (DCI) including a HARQprocess number field; identifying at least two configurations to bereleased among the configurations for the plurality of downlink SPSresources based on the first DCI, a value of the HARQ process numberfield in the first DCI corresponding to the at least two configurationsto be released; and releasing the at least two configurations.
 4. Themethod of claim 3, further comprising: identifying whether informationrelated to release of single or multiple configurations is configured,wherein in case that the information is configured, the value of theHARQ process number field indicates to release the at least twoconfigurations corresponding to the value, and wherein in case that theinformation is not configured, the value of the HARQ process numberfield indicates a release for a corresponding configuration with anidentifier which is a same value as the value of the HARQ process numberfield.
 5. The method of claim 3, further comprising: receiving, from thebase station, second DCI including the HARQ process number field and aredundancy version field; and activating a configuration with anidentifier having a same value as a value of the HARQ process numberfield in the second DCI, based on a value of the redundancy versionfield.
 6. The method of claim 3, wherein the first DCI includes aredundancy version field, a modulation and coding scheme field, and afrequency domain resource assignment field, and wherein the at least twoconfigurations are released based on a value of the redundancy versionfield, a value of the modulation and coding scheme field, and a value ofthe frequency domain resource assignment field.
 7. A method performed bya base station in a wireless communication system, the methodcomprising: identifying a plurality of downlink semi-persistentscheduling (SPS) resources; transmitting, to a terminal, one or more SPSphysical downlink shared channels (PDSCHs) based on the plurality ofdownlink SPS resources; and receiving, from the terminal, hybridautomatic repeat request-Acknowledgement (HARQ-ACK) informationcorresponding to a first SPS PDSCH associated with a downlink SPSresource with a lowest number configured by a higher layer signaling, incase that the first SPS PDSCH associated with the downlink SPS resourcewith the lowest number at least partially overlaps with any other SPSPDSCH.
 8. The method of claim 7, wherein the HARQ-ACK information isreceived on a physical uplink control channel (PUCCH).
 9. The method ofclaim 7, further comprising: transmitting, to the terminal,configurations for the plurality of downlink SPS resources; andtransmitting, to the terminal, first downlink control information (DCI)including a HARQ process number field, wherein at least twoconfigurations are to be released among the configurations for theplurality of downlink SPS resources based on the first DCI, a value ofthe HARQ process number field in the first DCI corresponding to the atleast two configurations to be released.
 10. The method of claim 9,further comprising: transmitting, to the terminal, information relatedto release of single or multiple configurations, wherein in case thatthe information is transmitted, the value of the HARQ process numberfield indicates to release the at least two configurations correspondingto the value.
 11. The method of claim 9, further comprising:transmitting, to the terminal, second DCI including the HARQ processnumber field and a redundancy version field, wherein a configurationwith an identifier is activated based on a value of the redundancyversion field, the identifier having a same value as a value of the HARQprocess number field in the second DCI.
 12. A terminal in a wirelesscommunication system, the terminal comprising: a transceiver configuredto transmit and receive a signal; and a controller configured to:identify a plurality of downlink semi-persistent scheduling (SPS)resources, receive one or more SPS physical downlink shared channels(PDSCHs) based on the plurality of downlink SPS resources, and reporthybrid automatic repeat request-Acknowledgement (HARQ-ACK) informationcorresponding to a first SPS PDSCH associated with a downlink SPSresource with a lowest number configured by a higher layer signaling, incase that the first SPS PDSCH associated with the downlink SPS resourcewith the lowest number at least partially overlaps with any other SPSPDSCH.
 13. The terminal of claim 12, wherein the controller is furtherconfigured to: receive, from a base station, configurations for theplurality of downlink SPS resources, receive, from the base station,first downlink control information (DCI) including a HARQ process numberfield, identify at least two configurations to be released among theconfigurations for the plurality of downlink SPS resources based on thefirst DCI, a value of the HARQ process number field in the first DCIcorresponding to the at least two configurations to be released, andrelease the at least two configurations, and wherein the HARQ-ACKinformation is transmitted on a physical uplink control channel (PUCCH).14. The terminal of claim 13, wherein the controller is furtherconfigured to: identify whether information related to release of singleor multiple configurations is configured, wherein in case that theinformation is configured, the value of the HARQ process number fieldindicates to release the at least two configurations corresponding tothe value, and wherein in case that the information is not configured,the value of the HARQ process number field indicates a release for acorresponding configuration with an identifier which is a same value asthe value of the HARQ process number field.
 15. The terminal of claim13, wherein the controller is further configured to: receive, from thebase station, second DCI including the HARQ process number field and aredundancy version field, and activate a configuration with anidentifier having a same value as a value of the HARQ process numberfield in the second DCI, based on a value of the redundancy versionfield.
 16. A base station in a wireless communication system, the basestation comprising: a transceiver configured to transmit and receive asignal; and a controller configured to: identify a plurality of downlinksemi-persistent scheduling (SPS) resources, transmit, to a terminal, oneor more SPS physical downlink shared channels (PDSCHs) based on theplurality of downlink SPS resources, and receive, from the terminal,hybrid automatic repeat request-Acknowledgement (HARQ-ACK) informationcorresponding to a first SPS PDSCH associated with a downlink SPSresource with a lowest number configured by a higher layer signaling, incase that the first SPS PDSCH associated with the downlink SPS resourcewith the lowest number at least partially overlaps with any other SPSPDSCH.
 17. The base station of claim 16, wherein the controller isfurther configured to: transmit, to the terminal, configurations for theplurality of downlink SPS resources, and transmit, to the terminal,first downlink control information (DCI) including a HARQ process numberfield, wherein at least two configurations are to be released among theconfigurations for the plurality of downlink SPS resources based on thefirst DCI, a value of the HARQ process number field in the first DCIcorresponding to the at least two configurations to be released, andwherein the HARQ-ACK information is received on a physical uplinkcontrol channel (PUCCH).
 18. The base station of claim 17, wherein thecontroller is further configured to transmit, to the terminal,information related to release of single or multiple configurations, andwherein in case that the information is transmitted, the value of theHARQ process number field indicates to release the at least twoconfigurations corresponding to the value.
 19. The base station of claim17, wherein the controller is further configured to transmit, to theterminal, second DCI including the HARQ process number field and aredundancy version field, and wherein a configuration with an identifieris activated based on a value of the redundancy version field, theidentifier having a same value as a value of the HARQ process numberfield in the second DCI.
 20. The base station of claim 17, wherein thefirst DCI includes a redundancy version field, a modulation and codingscheme field, and a frequency domain resource assignment field, andwherein the at least two configurations are released based on a value ofthe redundancy version field, a value of the modulation and codingscheme field, and a value of the frequency domain resource assignmentfield.